CN216729558U

CN216729558U - Rigid powder forming die pressing device

Info

Publication number: CN216729558U
Application number: CN202220371715.8U
Authority: CN
Inventors: 胡子木; 周天泽; 杨国龙; 崔美玉
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-06-14
Anticipated expiration: 2032-02-22

Abstract

The utility model discloses a rigid powder forming die device which comprises a rigid die, a pressure head matched with the rigid die and a pressure rod connected with the pressure head, wherein the bottom surface of the pressure head is provided with a spiral groove, the spiral groove is communicated with an airflow channel, and the airflow channel is used for connecting negative pressure generating equipment; also comprises a gas-solid isolating layer arranged at the bottom of the pressure head. The utility model provides a rigid powder forming die device, which solves the technical problems that in the prior art, the forming quality is easily influenced by residual gas in a powder forming process, the purposes of improving the forming blank quality and reducing gas residues are realized, and the waste of raw materials and the pollution to the environment are reduced.

Description

Rigid powder forming die pressing device

Technical Field

The utility model relates to the field of powder forming, in particular to a rigid powder forming die pressing device.

Background

Powder forming is a process for compacting a metal powder body into a compact having a certain shape, size, density and strength, and is one of the basic processes of powder metallurgy, wherein press forming on an oil press using a rigid die is one of the most widely used and mature forming methods. In the mature process of powder molding, a molding die is generally fixed at the center of a platen of a molding press, powder is filled into the die, and pressure is applied from above by a ram of the press. The forming process has the advantages of standard forming shape and high forming efficiency. However, the defect is that in the forming process, air in the die cavity and the powder is completely discharged by means of a gap between the pressure head and the inner wall of the die cavity, the discharging difficulty is high, partial gas is often remained in the formed blank, when the formed blank enters the next procedure for sintering or viscosity removal, deformation or cracking is easily caused, and in severe cases, even after the pressure head is arranged after forming and pressure is relieved, the formed blank is immediately subjected to layered cracking, so that the rejection rate is high, and the quality and the efficiency of powder forming are seriously influenced. Moreover, the traditional exhaust mode can generate a large amount of dust in the pressing process and seriously pollute the surrounding air. Similarly, a small amount of powder is leaked from the bottom of the rigid mold due to a gap between the driving mechanism and the bottom plate, which causes waste, and even pollutes the driving mechanism of the equipment and the corresponding oil cylinder in severe cases.

SUMMERY OF THE UTILITY MODEL

The utility model provides a rigid powder forming die device, which solves the technical problems that in the prior art, the forming quality is easily influenced by residual gas in a powder forming process, the purposes of improving the forming blank quality and reducing gas residues are realized, and the waste of raw materials and the pollution to the environment are reduced.

The utility model is realized by the following technical scheme:

a rigid powder forming die pressing device comprises a rigid die, a pressing head matched with the rigid die and a pressing rod connected with the pressing head, wherein a spiral groove is formed in the bottom surface of the pressing head and is communicated with an airflow channel, and the airflow channel is used for being connected with negative pressure generating equipment; the gas-solid separation layer is arranged at the bottom of the pressure head.

Aiming at the problem that the powder forming process in the prior art is easy to influence the forming quality due to residual gas, the utility model provides a rigid powder forming die device, wherein a rigid die, a pressure head, a pressure rod and the like are all in the prior art of a die press and are not described herein again. Spiral helicine recess is seted up in the bottom surface of pressure head to this application, be called the helicla flute, and set up the airflow channel with the helicla flute intercommunication, use negative pressure generating equipment and airflow channel intercommunication at the moulding press during operation, thereby can realize extracting the inside negative pressure of mould at powder press forming in-process, the limit blank pressing is taken out, can press more tightly in press forming in-process, and then show the inside remaining air of reduction type embryo, realize avoiding the product layering fracture, improve the effect of shaping quality. Through the helicla flute of pressure head bottom surface in this application, can be so that the negative pressure that is used for sucking the air more even distributes to this homogeneity and the wholeness that improves the exhaust effect. In addition, this application sets up the gas-solid isolation layer bottom the pressure head, and the gas-solid isolation layer is used for keeping apart gas and solid as the name implies for the air can pass through the gas-solid isolation layer, and the powder of solid can't be through the gas-solid isolation layer, avoids this application to take out the mistake of powder. Of course, the gas-solid barrier layer may be implemented using any barrier known in the art that is capable of achieving separation of gas from solids.

In conclusion, the problem that in the traditional compression molding process, the air is not smoothly exhausted and the air in the powder cannot be exhausted completely due to the fact that the air is passively exhausted only by the gap between the periphery of the pressure head and the inner wall of the molding cavity is solved, and therefore the ideal molding blank effect is achieved. In addition, because this application has adopted the mode of initiative suction to exhaust, the air gets into the helicla flute in proper order and the air current channel is unified to be discharged away, can not be scattered the excessive everywhere, and has the separation of gas-solid isolation layer, consequently still solved prior art dust pollution's in the operation process problem to the powder recycle who smugglies secretly in the gas that discharges away in unison.

Further, the airflow channel is positioned inside the pressure head. The body that this scheme passed through the pressure head provides airflow channel for the helicla flute to practice thrift equipment's volume, reduce occupation space. Wherein those skilled in the art will understand that the air flow channel may be a pipe passing through the pressure head or may be formed by opening a hole in the air flow channel.

Furthermore, the gas-solid isolating layer is made of carbon fiber materials, and the carbon fiber materials are soft and can play a certain protection role in the bottom of the pressure head.

Further, the gas-solid isolation layer bonds in the pressure head bottom surface to guarantee the abundant and stable being connected of gas-solid isolation layer and pressure head, avoid the damage to the pressure head simultaneously.

Furthermore, the device also comprises a lifting device positioned in the rigid mould, and the lifting device is in dynamic sealing fit with the inner wall of the rigid mould. In this scheme, elevating gear is used for upwards ejecting the shaping embryo that the suppression is good and demolds. Can adopt arbitrary current dynamic seal mode to cooperate between elevating gear and the rigidity mould inner wall to avoid the powder to fall into to below space downwards, and simultaneously when through this application press forming and suction, avoid with the air suction in below space to the powder inside. Wherein, arbitrary lift mode among the prior art all can be applicable to among the elevating gear of this application.

Furthermore, the lifting device and the inner wall of the rigid mold are sealed through a sealing ring.

Furthermore, the bottom of the rigid mold is open, the rigid mold is arranged on the workbench, and the lifting device comprises a lifting base in sliding fit with the inner wall of the rigid mold and a driving device for driving the lifting base to lift; the sealing ring is located inside the rigid mold and embedded on the upper surface of the workbench, and the driving device is located inside the sealing ring.

The open rigidity mould in bottom is arranged in on the workstation in this scheme for the bottom surface use of rigidity mould is regarded as to the upper surface of workstation, and wherein the lift base is driven by drive arrangement, can slide from top to bottom in rigidity mould inside, with the realization with shaping embryo ejecting effect that makes progress. The sealing ring is embedded on the top surface of the workbench, and the sealing ring is sleeved outside the driving device to realize sealing. Specifically, the method comprises the following steps: in the normal compression molding process, the lifting base descends to fully extrude the sealing ring, and even if powder leaks to the lower part of the lifting base, the powder is always positioned outside the sealing ring and cannot enter the sealing ring, so that any interference on the driving device cannot be caused.

Further, the lifting base divides the interior of the rigid mold into a forming cavity and a sealing cavity which are distributed up and down; the side wall of the rigid mould is provided with an air inlet hole and an air outlet hole which are opposite to each other, and the air inlet hole and the air outlet hole are always positioned in the sealed cavity; the air inlet and the air outlet are respectively opened and closed through valves.

In the scheme, the lifting base separates the rigid mold into an upper molding cavity and a lower sealing cavity, and a person skilled in the art understands that the volumes of the molding cavity and the sealing cavity are not fixed and can be changed relatively along with the up-and-down movement of the lifting mold. According to the scheme, the air inlet hole and the air outlet hole are respectively formed in the two opposite side walls of the sealing cavity, and the sealing cavity is closed by using valves in the compression molding process; after the press forming operation is finished, the valves at the two sides are opened firstly, air is blown inwards from the air inlet holes for cleaning, and then powder possibly remaining in the valves is properly blown out from the air outlet holes, so that the possible residue phenomenon of the powder in the sealed cavity is reduced. After the blowing operation is finished, the lifting base is driven by the driving device to lift, and the formed blank is ejected upwards.

Furthermore, the air inlet pipe is communicated with the air inlet hole, so that the air inlet pipe is conveniently communicated with an external air source (such as a blower and the like).

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. according to the rigid powder forming die pressing device, when the die pressing machine works, the negative pressure generating equipment is communicated with the airflow channel, so that negative pressure extraction of the interior of a die in the powder pressing forming process can be realized, the pressure extraction can be performed while pressing the edge and the pressure can be increased more and more tightly in the pressing forming process, further, residual air in a blank is remarkably reduced, the product is prevented from being layered and cracked, and the forming quality is improved.

2. According to the rigid powder forming die device, the gas-solid isolation layer is arranged at the bottom of the pressing head, so that air can pass through the gas-solid isolation layer, and solid powder cannot pass through the gas-solid isolation layer, and the phenomenon that the powder is drawn by mistake in the application is avoided.

3. The rigid powder forming die pressing device can realize rapid and efficient die release through the lifting device.

4. The rigid powder forming die pressing device solves the problem of dust pollution in the operation process in the prior art, reduces the waste of raw materials, and avoids the influence and the interference of the raw materials on a driving device.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

figure 2 is a schematic view of the bottom surface of the indenter in an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

the method comprises the following steps of 1-a rigid die, 2-a pressure head, 3-a pressure rod, 4-an airflow channel, 5-a gas-solid isolation layer, 7-a spiral groove, 8-a sealing ring, 9-a workbench, 10-a lifting base, 11-a driving device, 12-a forming cavity, 13-a sealing cavity, 14-an air inlet hole, 15-an air outlet hole and 16-an air inlet pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention. In the description of the present application, it is to be understood that the terms "front", "back", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the scope of the present application.

Example 1:

as shown in fig. 1 and 2, the rigid powder forming die device includes a rigid die 1, a pressing head 2 matched with the rigid die 1, and a pressing rod 3 connected to the pressing head 2, wherein a spiral groove 7 is formed in a bottom surface of the pressing head 2, the spiral groove 7 is communicated with an air flow channel 4, and the air flow channel 4 is used for connecting a negative pressure generating device; also comprises a gas-solid isolating layer 5 arranged at the bottom of the pressure head 2.

As shown in fig. 1, the air flow channel 4 is located inside the head 2.

Preferably, the gas-solid separation layer 5 is made of a carbon fiber material, and the gas-solid separation layer 5 is bonded to the bottom surface of the pressure head 2.

Preferably, the present embodiment further includes a lifting device located inside the rigid mold 1, and the lifting device is in dynamic sealing fit with the inner wall of the rigid mold 1 through a sealing ring.

Preferably, the gas-solid separation layer in this embodiment is a carbon fiber soft felt.

When the device works, the airflow channel 4 is communicated with the negative pressure generating device, powder is filled into the rigid mold 1, a layer of disposable non-woven fabric is laid on the powder, then the pressing head is pressed downwards to perform pressing, and meanwhile the negative pressure generating device is opened.

The lifting device in this embodiment can be implemented by any existing lifting technology that can be implemented by those skilled in the art.

Example 2:

a rigid powder forming die pressing device is based on embodiment 1, as shown in figure 1, in this embodiment, the bottom of the rigid die 1 is open, and the rigid die 1 is installed on a workbench 9, the lifting device includes a lifting base 10 in sliding fit with the inner wall of the rigid die 1, and a driving device 11 for driving the lifting base 10 to lift; the sealing ring 8 is positioned inside the rigid mould 1 and embedded on the upper surface of the workbench 9, and the driving device 11 is positioned inside the sealing ring 8.

The lifting base 10 divides the interior of the rigid mold 1 into a forming cavity 12 and a sealing cavity 13 which are distributed up and down; the side wall of the rigid mould 1 is provided with an air inlet 14 and an air outlet 15 which are opposite to each other, and the air inlet 14 and the air outlet 15 are always positioned in the sealed cavity 13; the air inlet 14 and the air outlet 15 are respectively opened and closed through valves.

The embodiment also comprises an air inlet pipe 16 communicated with the air inlet hole 14, wherein the air inlet pipe is used for being communicated with the air blowing equipment; and a gas collecting device is arranged at the exhaust hole for gas collection, so that dust pollution is avoided, and the collected powder can be recycled.

When the device is used, the driving device drives the lifting base to descend to the bottom of the stroke of the lifting base and fully extrude the sealing ring, then normal compression molding operation is carried out, and negative pressure generating equipment also needs to be opened in the operation process; after the compression molding operation is finished, firstly, the valves of the air inlet holes 14 and the air outlet holes 15 on the two sides are opened, the air blowing device is started, air is blown inwards from the air inlet holes for blowing, and after the blowing operation is finished, the lifting base is driven by the driving device to be lifted, so that the molded blank is ejected upwards.

The driving device in this embodiment can be implemented by any existing linear driving technology that can be implemented by those skilled in the art.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Further, the term "connected" used herein may be directly connected or indirectly connected via other components without being particularly described.

Claims

1. A rigid powder forming die pressing device comprises a rigid die (1), a pressing head (2) matched with the rigid die (1) and a pressing rod (3) connected with the pressing head (2), and is characterized in that a spiral groove (7) is formed in the bottom surface of the pressing head (2), the spiral groove (7) is communicated with an air flow channel (4), and the air flow channel (4) is used for being connected with negative pressure generating equipment; also comprises a gas-solid isolating layer (5) arranged at the bottom of the pressure head (2).

2. A rigid powder compaction molding apparatus according to claim 1 wherein the gas flow channel (4) is located inside the ram (2).

3. A rigid powder compaction molding apparatus according to claim 1 wherein the gas-solid barrier layer (5) is made of carbon fiber material.

4. A rigid powder compaction molding apparatus according to claim 1 wherein the gas-solid barrier layer (5) is bonded to the bottom surface of the ram (2).

5. A rigid powder compaction moulding apparatus according to claim 1 further comprising a lifting device located inside the rigid mould (1), wherein the lifting device is in dynamic sealing engagement with the inner wall of the rigid mould (1).

6. A rigid powder forming die assembly according to claim 5 wherein the lifting means is sealed to the inner wall of the rigid die (1) by a sealing ring (8).

7. A rigid powder compaction molding apparatus according to claim 6 wherein the rigid mold (1) is open at the bottom and the rigid mold (1) is mounted on a table (9); the lifting device comprises a lifting base (10) in sliding fit with the inner wall of the rigid mold (1) and a driving device (11) for driving the lifting base (10) to lift; sealing washer (8) are located inside rigid mould (1) and inlay and establish at workstation (9) upper surface, drive arrangement (11) are located inside sealing washer (8).

8. A rigid powder forming die-pressing device as claimed in claim 7, wherein said lifting base (10) divides the interior of the rigid die (1) into a forming cavity (12) and a sealing cavity (13) which are distributed up and down; an air inlet hole (14) and an air outlet hole (15) which are opposite to each other are formed in the side wall of the rigid mold (1), and the air inlet hole (14) and the air outlet hole (15) are always positioned in the sealed cavity (13); the air inlet hole (14) and the air outlet hole (15) are respectively opened and closed through valves.

9. A rigid powder compaction molding apparatus according to claim 8 further comprising an air inlet tube (16) in communication with the air inlet hole (14).